12432243566557 has 2 divisors, whose sum is σ = 12432243566558. Its totient is φ = 12432243566556.

The previous prime is 12432243566549. The next prime is 12432243566579. The reversal of 12432243566557 is 75566534223421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12414164343876 + 18079222681 = 3523374^2 + 134459^2 .

It is a cyclic number.

It is not a de Polignac number, because 12432243566557 - 2³ = 12432243566549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12432243566498 and 12432243566507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12432243566357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6216121783278 + 6216121783279.

It is an arithmetic number, because the mean of its divisors is an integer number (6216121783279).

Almost surely, 2^{12432243566557} is an apocalyptic number.

It is an amenable number.

12432243566557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12432243566557 is an equidigital number, since it uses as much as digits as its factorization.

12432243566557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288000, while the sum is 55.

Adding to 12432243566557 its reverse (75566534223421), we get a palindrome (87998777789978).

The spelling of 12432243566557 in words is "twelve trillion, four hundred thirty-two billion, two hundred forty-three million, five hundred sixty-six thousand, five hundred fifty-seven".